The A REVIEW ON CASING WHILE DRILLING (CWD) TECHNOLOGY FOR OIL AND GAS PRODUCTION
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Abstract
The extraction of petroleum fluids from sub-surface accumulations mandates the drilling of a well into the formation containing the
accumulation. The drilling techniques have evolved over time to overcome several challenges while some of the issues still prevail with the
currently used drilling practices like loss circulation, large tripping time to change bottom hole assembly, stuck pipe problems and low well
bore stability, to name a few. These decrease the drilling efficiency and increase the Non-Productive Time (NPT) of this highly
capitalintensive industry encouraging the Petroleum Industry to look for new technology. Casing while Drilling (CwD) is a technique of
drilling which has been proven to alleviate many of the problems faced while drilling. It has proven to be beneficial in controlling loss
circulation and improving wellbore stability by ‘Plastering’ effect, high quality cement job and increased rig floor safety. It uses smaller rig
and less fuel thereby reducing carbon footprint in the environment. This paper reviews casing while drilling (CwD) technology for oil and
gas production. Categories, components, accessories and challenges of CwD are discussed in this paper
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